Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Yoshihisa Takayama Last modified date:2018.06.07

Assistant Professor / Department of Mechanical Engineering / Department of Mechanical Engineering / Faculty of Engineering


Presentations
1. Modeling of Parallel Motion Type Magnetic Damper Composed of Conducting Plate and Magnets with Steel Plates
Eddy currents are generated by the relative motion of a conducting plate and a magnet. Magnetic damper is a device that utilizes the magnetic drag force produced by the eddy current. The author call the magnetic damper moving parallel to the conducting disk the parallel-motion type magnetic damper. The author previously proposed the vector potential method for magnetic damper. The method has a good point that magnetic damping force can be calculated accuracy when a parallel-motion type magnetic damper is composed of rectangular magnets with alternating directional magnetic poles and a conducting plate. Generally ferromagnetic metal, for example a steel plate (S45C), has a property known as concentrating magnetic flux into itself. In this paper, using image method, we propose the new vector potential method for the magnetic damper with steel plates outside the rectangular magnets with alternating directional magnetic poles. The image method is a method for calculating a magnetic field by adding image currents in order to satisfy the boundary conditions between a magnetic material area and an air area in the magnetic field and the vector potential field. Damping ratios calculated by the new vector potential method are compared to the tests. As a result, analytical results are in good agreement with the experimental results..
2. Modeling of Skin Effect on Axisymmetric Magnetic Damper (Modal Analysis of Eddy Current).
3. Study of Modeling of Magnetic Damper that Magnet Moves Parallel to Conductor
(Modeling of Skin Effect of Eddy Current on Magnetic Damper).
4. Study of Magnetic Damper Composed of Circular Magnet Moving Coaxially and Relatively to Conducting Disk
(Modeling of Skin Effect of Eddy Current on Magnetic Damper).
5. Modeling of Magnetic Damper Composed of a Conducting Disk and a Ring Magnet Moving Perpendicularly to the Disk.
6. Study on Modeling of Parallel Motion Type Magnetic Dampers
- Discussion about the Relation between Magnetic Field Distribution and Movement Directions -
.
7. Study of the Modeling of Magnetic Dmper.
8. Study on Magnetic Damper Composed of Combined Magnets
(Magnetic Damper Composed of Rectangular Magnets).
9. Study on Magnetic Damper Composed of Combined Magnets
(Magnetic Damper Composed of Linear Array Magnets).
10. Influence of Magnetic Skin Effect on Magnetic Damper.
11. Study on Magnetic Damper Composed of Combined Magnet.
12. Estimation of Uncomfortable Conditions by Biological Signal Processing.
13. Instrumentation technology and evaluation of living body flexibility.
14. Magnetic Damper consisting of Ball-type Magnet and Conducting Shell.
15. A Magnetic Damper Based on Lorentz Force (Magnetic Damper Consisting of Hollow-Cylindrical Conductor and Ring-Shaped Magnet ).
16. A Magnetic Damper Based on Lorentz Force (Modeling and Experimental Comparisons).
17. Magnetic Damper Composed of a Ball Type Magnet (Experiments and Speculations).
18. Magnetic Damper Based on Lorentz Force (Experiments and Speculations).
19. Magnetic Damper Using Quadrilateral Magnet.
20. Unstable Vibration of a Rotor caused by a Magnetic Damper.
21. Magnetic Damper Based on Lorentz Force.
22. Unstable Vibration of a Rotor caused by a Magnetic Damper.
23. Unstable vibration of a rotating machine caused by a magnetic damper
(Comparison between conductor rotating type and magnet rotating type).
24. Unstable Vibrations of Rotating Machinery Caused by Magnetic Damper
(Modeling of Magnetic Damper by Loop Model).
25. Unstable Vibration of Rotating Machinery Generated in DC Current Electromagnetic Field(Modeling and Experiments).